What was found
PILOT REPORTED THAT SHORTLY AFTER TAKEOFF THE ACFT HAD A COMPLETE ELECTRICAL FAILURE. THE PILOT ELECTED TO RETURN TO THE DEPARTURE AIRPORT AND LANDED THE ACFT SAFELY. WHEN INSPECTED BY MX A BATTERY RELAY WAS FOUND SHORTED TO GROUND. THE BATTERY RELAY WAS REPLACED. FOLLOWING THAT, WHEN POWER WAS APPLIED TO AIRCRAFT, MX FOUND THE RT STARTER ANNUNCIATOR ILLUMINATED AND VOLTAGE ON RT STARTER CABLE. THE STARTER RELAY WAS R & R IAW MM 80.